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Thread: Black screen after logout

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  1. #1
    Join Date
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    Kubuntu 12.04 Precise Pangolin

    Black screen after logout

    Hello all,
    If I try to logout or switch user, I end up with a black screen and a blinking cursor. I can type and the letters show up on the screen but don't do anything. I can do Ctrl-Alt-F1 and then "sudo service kdm restart", but I'd rather fix the underlying problem...
    Google gives several pages with similar problems but they all seem pretty old (2007), and they don't seem to apply to 10.10.
    Any idea ?
    Thanks

  2. #2
    Join Date
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    Re: Black screen after logout

    What videocard driver are you using?

    In the past, some drivers (notably Intel's) made the X server crash when trying to regenerate the X session at logout. In essence, instead of shutting down X and starting it again, it tries to reuse the same process to save time and resources. If so, I think there will be a crash backtrace in /var/log/kdm.log.

    You can disable this resetting behavior in /etc/kde4/kdm/kdmrc by finding the TerminateServer=true line and uncommenting it.

    Code:
    # Restart instead of resetting the local X-server after session exit.
    # Use it if the server leaks memory etc.
    # Default is false
    TerminateServer=true
    Use whichever text editor you're comfortable with.

    To do it all from the terminal;
    Code:
    $ FILE=/etc/kde4/kdm/kdmrc
    $ sudo cp $FILE ${FILE}.orig
    $ sudo sed -ie 's/\#TerminateServer/TerminateServer/g' $FILE
    ...

  3. #3
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    Re: Black screen after logout

    Thanks for the suggestions:
    Code:
    # lshw
               *-display
                    description: VGA compatible controller
                    product: Radeon XPRESS 200M 5955 (PCIE)
                    vendor: ATI Technologies Inc
                    physical id: 5
                    bus info: pci@0000:01:05.0
                    version: 00
                    width: 32 bits
                    clock: 66MHz
                    capabilities: pm vga_controller bus_master cap_list rom
                    configuration: driver=radeon latency=66 mingnt=8
                    resources: irq:17 memory:c8000000-cfffffff ioport:9000(size=256) memory:c0100000-c010ffff memory:c0120000-c013ffff
    As for /etc/kde4/kdm/kdmrc, there's no such TerminateServer in it:
    Code:
    [General]
    ConfigVersion=2.4
    ConsoleTTYs=tty1,tty2,tty3,tty4,tty5,tty6
    GreeterUID=kdm
    PidFile=/var/run/kdm.pid
    ReserveServers=:1,:2,:3
    ServerVTs=-7
    StaticServers=:0
    
    [Shutdown]
    BootManager=None
    HaltCmd=/sbin/halt
    RebootCmd=/sbin/reboot
    
    [X-*-Core]
    AllowNullPasswd=false
    AllowRootLogin=false
    AllowShutdown=Root
    AutoReLogin=false
    ClientLogFile=.xsession-errors-%d
    Reset=/etc/kde4/kdm/Xreset
    Session=/etc/kde4/kdm/Xsession
    Setup=/etc/kde4/kdm/Xsetup
    Startup=/etc/kde4/kdm/Xstartup
    
    [X-*-Greeter]
    AntiAliasing=false
    ColorScheme=
    FaceSource=AdminOnly
    FailFont=Sans Serif,10,-1,5,75,0,0,0,0,0
    GUIStyle=
    GreetFont=Serif,20,-1,5,50,0,0,0,0,0
    GreetString=Welcome to %s at %n
    GreeterPos=50,50
    HiddenUsers=
    Language=en_US
    LogoArea=Logo
    LogoPixmap=/usr/share/kde4/apps/kdm/pics/kdelogo.png
    MaxShowUID=29999
    MinShowUID=1000
    Preloader=/usr/bin/preloadkde
    SelectedUsers=
    ShowUsers=NotHidden
    SortUsers=true
    StdFont=Sans Serif,9,-1,5,50,0,0,0,0,0
    Theme=/usr/share/kde4/apps/kdm/themes/ethais
    UseBackground=true
    UseTheme=true
    UserCompletion=false
    UserList=true
    
    [X-:*-Core]
    AllowNullPasswd=true
    AllowShutdown=All
    NoPassEnable=false
    NoPassUsers=
    ServerArgsLocal=-nr -nolisten tcp
    ServerCmd=/usr/bin/X
    
    [X-:*-Greeter]
    AllowClose=true
    DefaultUser=dargaud
    FocusPasswd=true
    LoginMode=DefaultLocal
    PreselectUser=Previous
    
    [X-:0-Core]
    AutoLoginEnable=false
    AutoLoginLocked=false
    AutoLoginUser=
    ClientLogFile=.xsession-errors
    
    [Xdmcp]
    Enable=false
    Willing=/etc/kde4/kdm/Xwilling
    I could try adding it, but to which section ? As for /var/log/kdm.log, nothing much of interest there. Maybe right after a lockup, I'll check next time:
    Code:
    ddxSigGiveUp: Closing log
    
    X.Org X Server 1.9.0
    Release Date: 2010-08-20
    X Protocol Version 11, Revision 0
    Build Operating System: Linux 2.6.24-27-server i686 Ubuntu
    Current Operating System: Linux darlap 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686
    Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=dd00ea4d-5c75-4997-bd3e-3fbdd959deba ro quiet splash
    Build Date: 23 November 2010  09:54:06PM
    xorg-server 2:1.9.0-0ubuntu7.1 (For technical support please see http://www.ubuntu.com/support) 
    Current version of pixman: 0.18.4
            Before reporting problems, check http://wiki.x.org
            to make sure that you have the latest version.
    Markers: (--) probed, (**) from config file, (==) default setting,
            (++) from command line, (!!) notice, (II) informational,
            (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
    (==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan 13 11:07:11 2011
    (==) Using system config directory "/usr/share/X11/xorg.conf.d"
    (II) [KMS] Kernel modesetting enabled.
    QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such file or directory
    QFileSystemWatcher: failed to add paths: /tmp/1205778025/.config/ibus/bus
    Bus::open: Can not get ibus-daemon's address. 
    IBusInputContext::createInputContext: no connection to ibus-daemon

  4. #4
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    Re: Black screen after logout

    Well, I added TerminateServer=true to the [X-*-Core] section and it seems to logout fine now. Thanks.

  5. #5
    Join Date
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    Re: Black screen after logout

    Thanks a bunch guys!

    The problem also occurred with my ASUS motherboard M4A88TD-V EVO/USB3 featuring an integrated ATI Radeon HD 4250 GPU running 10.10 64bit and a non-free driver that Ubuntu was kind enough to find and install for me. Again, there is no commented out TerminateServer line in the /etc/kde4/kdm/kdmrc file, but sticking a new line in the [X-*-Core] section of that file did the trick for me as well.

    Many thanks again.

  6. #6
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    Re: Black screen after logout

    Works like a charm.... thanks!
    -OG-

  7. #7
    Join Date
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    Re: Black screen after logout

    I do not see how to delete messages.
    Last edited by lcb1; May 9th, 2011 at 11:53 AM.

  8. #8
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    Re: Black screen after logout

    New Kubuntu version (11.04) - same problem - same solution

  9. #9
    Join Date
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    Re: Black screen after logout

    Thank you, that terminate option helped me also (Kubuntu 11.10 on a HP notebook model 635)

  10. #10
    Join Date
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    Re: Black screen after logout

    Great
    Thanks

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